Method for forming high abrasion resisting layers on parent materials

Abstract

A method for forming high abrasion resistive layers on parent materials in which power of an alloy iron including carbide generating elements is prepared using the atomizing method, sheets are formed from a mixture of the powder and a binder, the sheet is adhered to a parent material, and the sheet and the surface of the parent material are remelted by TIG arc to for a high alloy layer on the parent material.

What is claimed is: 
     
       1. Method for forming high abrasion resistive layers on parent materials comprising: a. forming a powder of an iron alloy including carbide generating elements by atomizing molten iron alloy containing said elements,   b. forming sheets of a thickness of 0.6 to 0.1 mm from a mixture of the powder of a. and a binder,   c. adhering each sheet of b. on a surface of a parent material,   d. dewaxing the sheet and   e. melting the sheet and the surface of the parent material by tungsten inert gas arc to form a high alloy layer on the parent material.   
     
     
       2. The method as claimed in claim 1 in which said iron alloy is comprised of Mo of 2.5 to 15.0 weight %, Cr smaller than 10 weight %, P of 0.5 to 3.0 weight %, C of 1.5 to 3.0 weight % and the remainder Fe. 
     
     
       3. The method as claimed in claim 2 in which the density of said sheet is 3.0 to 5.0 g/cm 3 . 
     
     
       4. The method as claimed in claim 3 in which said binder is an acrylic resin. 
     
     
       5. The method as claimed in claim 4 in which the acrylic resin of 1.0 to 10.0 weight % is added to the powder of 100 weight %. 
     
     
       6. The method as claimed in claim 5 in which the parent material is a cam for driving a valve of a combustion engine. 
     
     
       7. The method as claimed in claim 1 in which the density of the sheet is of 3.0 to 5.0 g/cm 3 . 
     
     
       8. The method as claimed in claim 1 in which said binder is an acrylic resin. 
     
     
       9. The method as claimed in claim 8 in which the acrylic resin of 1.0 to 10.0 weight % is added to said alloy powder. 
     
     
       10. The method as claimed in claim 1 in which said parent material is a cam for driving a valve of a combustion engine. 
     
     
       11. The method as claimed in claim 1 in which the melting of the surface of the parent material is started before a beginning end of said sheet adhered onto the article. 
     
     
       12. The method as claimed in claim 11 in which the melting of the surface of the parent material is started from a position whereat the surface of the parent material is covered with said sheet partially. 
     
     
       13. The method as claimed in claim 11 in which the melting of the surface of the parent material is completed at an ending end of said sheet. 
     
     
       14. The method as claimed in claim 13 in which said iron alloy is comprised of Mo of 2.5 to 15.0 weight %, Cr smaller than 10 weight %, P of 0.5 to 3.0 weight %, C of 1.5 to 5.0 weight % and the remainder Fe. 
     
     
       15. The method as claimed in claim 14 in which the density of said sheet is 3.0 to 5.0 g/cm 3 . 
     
     
       16. The method as claimed in claim 15 in which said binder is an acrylic resin. 
     
     
       17. The method as claimed in claim 16 in which the acrylic resin of 1.0 to 10.0 weight % is added to the alloy powder. 
     
     
       18. The method as claimed in claim 17 in which said powder of the iron alloy is smaller than 200 mesh. 
     
     
       19. The method as claimed in claim 1 in which said powder of the iron alloy is smaller than 200 mesh. 
     
     
       20. The method as claimed in claim 1 in which the melting by tungsten inert gas arc is performed under an inert atmosphere. 
     
     
       21. The method as claimed in claim 20 in which the dewaxing treatment is performed in N 2  gas at a temperature of 200° to 350° C. and for a time of 0.5 to 1.5 hours. 
     
     
       22. The method as claimed in claim 1 in which the dewaxing treatment is performed in N 2  gas at a temperature of 200° to 350° C. and for a time of 0.5 to 1.5 hours.